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                Pty的字符串                </h1>
                <p>时间限制：20s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：512MB</p>			</div>
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                                <h3>题目描述</h3><p><div>在神秘的东方有一棵奇葩的树，它有一个固定的根节点（编号为1）。树的每条边上都是一个字符，字符为a,b,c中的一个，你可以从树上的任意一个点出发，然后沿着远离根的边往下行走，在任意一个节点停止，将你经过的边的字符依次写下来，就能得到一个字符串，例如：</div>
<div><img src="../file/3756_0.gif" width="213" height="244" alt="" /></div>
<div>&nbsp;</div>
<div>在这棵树中我们能够得到的字符串是：</div>
<div>c, cb, ca, a, b, a</div>
<div>现在pty得到了一棵树和一个字符串S。如果S的一个子串[l,r]和树上某条路径所得到的字符串完全相同，则我们称这个子串和该路径匹配。现在pty想知道，S的所有子串和树上的所有路径的匹配总数是多少？</div>
<p></p></p><hr/><h3>输入格式</h3><p><div>第一行：n</div>
<div>接下来n-1行，每行一个整数fa, 一个字符c，字符和整数之间用一个空格隔开</div>
<div>第i行fa代表第i号节点的父亲，c表示第i号节点和fa的连边的字符</div>
<div>最后一行为字符串S</div>
<p></p></p><hr/><h3>输出格式</h3><p><div>输出共一行，表示匹配总数</div>
<p></p></p><hr/><h3>样例输入</h3><pre>5
1 c
2 b
1 a
2 a
cba</pre><hr/><h3>样例输出</h3><pre>5
【样例说明】
单个字符匹配的对数为4对，两个字符匹配的对数为1对：cb
			
</pre><hr/><h3>提示</h3><p><div>【数据规模】</div>
<div>N&lt;=800000<span class="Apple-tab-span" style="white-space:pre">	</span>树的最大深度&lt;=800000<span class="Apple-tab-span" style="white-space:pre">	</span></div>
<div><span style="color: rgb(255, 0, 0);">此题存在版权，故不再支持提交，保留在此只供大家参考题面！ 望见谅！</span></div>
<div></div>
<p></p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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